ANSI ASQ Z1.9 2003_百度文库

Sampling Procedures and Tables for Inspection by Variables for Percent Nonconforming is an acceptance sampling systemto be used on a continuing stream of lots for AQL specified. It provides tightened, normal, and reduced plans to be used onmeasurements which are normally distributed. Variation may be measured by sample standard deviation, sample range, orknown standard deviation. It is applicable only when the normality of the measurements is assured.

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CAUTION NOTICE: This American National Standard may be revised or withdrawn at any time. The procedures of theAmerican National Standards Institute require that action be taken to reaffirm, revise, or withdraw this standard no laterthan five years from the date of publication. Purchasers of American National Standards may receive current informationon all standards by calling or writing the American National Standards Institute.

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02/12/13 12:52 PMANSI ASQ Z1.9 2003_百度文库

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ANSI/ASQ Z1.9-2003

FOREWORD

(This foreword is not a part of Draft American National Standard—Sampling Procedures and Tables for Inspection byVariables for Percent Nonconforming, ANSI/ASQ Z1.9-2003)

This revision of ANSI/ASQC Z1.9-1993, “Sampling Procedures and Tables for Inspection by Variables for PercentNonconforming” was undertaken to allow for aligning the terminology of the standard with the terms of ANSI/ISO/ASQA3534-2-2004 (to be published), change the term Acceptable Quality Level (AQL) to Acceptance Quality Limit (AQL),

change the definition and explanation of AQL, change the Discontinuation of Inspection Rule, and to correct typographicaland computational errors within the standard.

The present revision ANSI/ASQ Z1.9-2003 continues to allow complete interchangeability of the tabulated plans with ISO 3951-1, which provided a graphical means for implementation of the plans. ANSI/ASQ Z1.9-2003 is also roughlymatched to ANSI/ASQ Z1.4-2003, which corresponds directly to the old military standard MIL-STD-105E. The matchingis sufficient to allow inspection under either standard for stated AQLs and inspection levels with reasonably equivalent pro-tection. Tables are given in Section E—Appendix that show differences in protection between ANSI/ASQ Z1.9-2003 andANSI/ASQ Z1.4-2003. These are for use in critical applications to determine whether moving from one standard to theother is appropriate.

Committee members serving as writers and editors of this standard were:

Herbert C. Monnich, Jr., ChairpersonWilliam C. DavisRudolf G. Kittlitz, Jr.Paul Roediger

Edward G. Schilling